“…Yellow solid, 76 % yield. Mixture of 2 inseparable diasteroisomers 3/1; 1 H NMR (400 MHz, CDCl 3 ) of the major diastereoisomer: δ = 8.69 (d, 1H, J = 4.8 Hz, H 1 ), 7,49-7.27 (m, 11H, H 3, H8, 9,10,11,12,16,17,18,19,20 ), 7.08 (d, 1H, J = 7.5 Hz, H 2 ), 6.23 (s,1H, H 6 ), 5.50 (s, 1H, H 14 ); 13 C { 1 H} NMR (75 MHz, CDCl 3 ): 170.1 (C 13 ), 154.0 (C 5 ), 150.3 (C 1 ), 135.5 (C 4 ), 134.0 (C 3 ), 133.4 (C 7 or C 15 ), 131.1 (C 15 or C 7 ), 129,4-129,1-128,9-128,1-128,0-127.5 (C 8,9,10,11,12, 6,17,18,19,20 ), 122.6 (C 2 ), 79.9 (C 4 ), 54.9 (C 13 ) ppm; HRMS (ESI): m/z calcd. for C 20 H 16 NO 2 : 302.1176, found 302.1176 [M + H] + .…”